Tire-pump.



g s. STAPLEY.

TIRE PUMP.

APPLIOA'I'IOH FILED NOV. 8, 1909.

Patented May 31, 19 i0.

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WILLIAhI S. STAPLEY, F BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE COE-STAPLEY coimncrronr.

TIRE-PUMP.

Specification of Le ters Patent.

Patented May 31, 1910.

Application filed November 8, 1909. Serial No. 526,769.

To all whom it may concern:

Be it known that I, \VILLIAM S. STAPLEY, a citizen of the United States, residing at Bridgeport, county of F airfield, State of Connecticut, have invented an Improvement in Tire-Pumps, of which the following is a specification.

This invention relates to double-acting hand air-pumps, so called, adapted for general use and especially adapted for inflating automobile tires, and the invention has for its object to produce a two-cylinder pump in which the cost of construction shall be reduced to the minimum and which while having ierfectly tight joints shall be so constructea that the pistons may be removed witbout disturbing the permanent parts of part of this specification, Figure 1 18 a view partly in elevation and partly in vertical sec-' tion, illustratin the construction and operation of my nove pump; Fig. 2 a partial plan view of the base showin the cylinders in horizontal section; and lig. 3 is a detail sect-i 1121 view showin the connection of the sine. cylinder with t e cap.

10 denotes the large cylinder, 11 the small cylinder, 12 the large piston, 13'the small piston, 14 the large piston rod, 15 the small piston rod, 16 the base, 17 the cap and 18 the ndle which is rigidly secured to the two piston rods.

An important feature of the invention is that both cylinders are rigidly and permanently secured to the base. This I accomplish in the manner which I will now describe. The base is shown as rovided with a raised hub 19 having threa ed sockets 20 and 21 to receive the large and small cylinders respectively, the lower ends of which are correspondingly threaded. At the base of each socket is a circumferential enlargement 22 and a shoulder 23, and below the shoulder in socket 20 is a recess 24 and below the shoulder in socket 21 is a recess 26 denotes an air passage leading from recess 24 to recess 25.

- 27 denotes steel washers which are made of slightly less diameter than the corresponding circumferential enlargements 22, are provided with central holes 28 and with upwnrdly and inwardly beveled edges as-at 29. The cylinders are secured in place by screwing them down forcibly upon the steel washers. When the ends of the cylinders in the turning in movement engage the beveled edges of the washers they are flanged outward into the peripheral recesses as at 30 filling the enlarge ments, making perfectly tight joints and rigidly and permanentlyse curing the cylinders to the base.

Another important feature of the invention is that the on is dctachably secured to the upper ends ot the cylinders so that it may be readily removed and the pistons drawn out. The cap is provided in its underside with an nnthrcaded hole 31 which receives large cylinder 10 freely and in its upper side with a corresponding larger hole 32 which is threaded to receive :1 correspondingly threaded screw plug 33 having/a central hole 31 through which the large piston rod 14 slides freely, it bein unnecessary to make a tight joint at this p ace for the reason that air-is taken in at the upper end of the small the large cylinder. In case 0 cylinder it is required that it be attached to the cap in such a manner as to bereadily detachable and at the same time that the joint be air-tight. This I rovide for by the construction which I will now describe. The cap is provided witha hole'39 through it in which are upper and lower circumferential shoulders and 41, the portions of the hole above and below: the shoulders being threaded. The'uppcr end of the small cylinder is provided with an outwardly turned flange 35 corresponding with lower shoulder 11, a packing washer 36 being interposed between the flange and shoulder. The flange is clamped tightly against the packing washer and a perfectly tight joint is formed by means of a screw plug 38 engaging hole 39 from the under side of the cap and having .1 hole through which the cy inder passes, the end of the screw plug engaging the flange, as clearly shown in Fig. 3. A screw plug 42 engages hole 39 from the upper side of the cap, a packing washer 57 being interposed between the screw plug and shoulder 40. This plug is provided with a l 1ole 43 through which small piston rod 15 passes freely and with a remove gland 45, and screw p threaded hole 44 which receives a gland 45. A packing washer 46 between the end of the gland and the base of hole 44 forms a stufling box about the piston rod and insures a tightjoint. The gland is preferably provided with a circular rib 56 which is forced into the packing washer.

The operation is as usual in um 8 of this character. Air from the small cy inder passes to a nozzle 47 through a passage 48 m which is a slide valve 49. During the down stroke of the pistons, air is received behind the large piston through holes 50 and the air before the large piston is forced through passage 26 into the small 0 linder and past the small piston and out t rough passage 48 and the nozzle. During the up stroke, air passes the lar piston free] and air behind the small iston is force out through passage 48 an the nozzle. To remove the pistons it is simply necessary to ugs 33 and 42 and then draw the pistons out from the cylinders. It will be noted that the upper end of the large cylinder is beveled outward as at 51 and that the upper end of the small cylinder is rounded outward as at 52 in forming the flange for convenience in inserting the pistons into the. cylinders again after they have been repaired or renewed. The istons'may be of any ordinary or preferre construction. I have shown pistons comprising cup-shaped flexible washers 53 which are clamped between metal washers 54, the cup-shaped washer of the large piston facin downward and the cup-shaped washer o the small piston facing upward so as to permit passage of air in both instances on the return stroke, which is the up stroke of the large piston and the down stroke of the small piston. The downward movement of the pistons is shown as stopped in the present instance by the engagement of the lower end of the large pistonro'l with the bottom of recem 24.

Having thus described my invention I claim: p

1. In a pump, the combination with a base having a threaded hole, a circumferential enlargement below the thread, and a shoulder below the cular eiuent and a metallic washer of slightly less diameter than the cnlargcmcnt which rests on the shoulder and IS provided with an upwardly and inwardly Y beveled edge, of a threaded cylinder screwed into the hole and permanently secured to the base by flangin the end thereof outward between the bevele edge of the washer and the wall of the enlargement. 2. In a pum the combination with a base, large and small cylinders secured thereto and pistons and piston rods, of at ca which receives the upper ends of the ylinders and screw plugs through which the piston rods pass so that the pistons may be removed without detaching the cylinders fromthe base or the cap from the cylinders.

3. In a pump, the combination with a base, large and small cylinders secured thereto and pistons and piston rods,'of a cap having holes to. receive the upper ends of the cylinders, a screw plug in one of said holes through which the lar e piston rod passes, a screw lug in the ot er hole provided with a stu ng box through which the small piston rod asses and means for securing the small cy inder to the cap with an air-tight joint:-

In a pum the combination with a base, large and small cylinders secured thereto, said small 0 linder having at its outer end an outw'ar ly turned flan e, pistons in. said cylinders and piston r s, of 0. cap having holes to receive the upper ends of the cylinders, a. screw plug in one of said holes through. which the urge cylinder rod passes, u per and lower shoulders in the other ho e, a packing washer between the flange of the small cylinder and the lower shoulder, a screw plug engaging said flange, a packing washer-upon the upper shoulder, a screw plug engaging said washer and a stufling box in said screw plug through which the small piston rod asses.

5. In a pum the com ination with a base and a cy inder secured thereto and having at its upper end an outwardly turned flange, of a cap having a hole with up r and lower shoulders, a packing washer b:- tween the flange of the cylinder and the lower shoulder, a screw plug engaging said flange, a packing washer on the upper shoulder, a screw plug engaging said washer and a stufiing box in said screw purpose set forth.

In testimonv whereof I atlix my signature in presence of two witnesses.

plug, for the.

WILLIAM s. STAPLEY.

Witnesses:

A. M. Woosrra, S. W. Arnnm'on. 

